Steven Charles Baldwin

US Patent:

20230089837, Mar 23, 2023

Filed:

Dec 22, 2020

Appl. No.:

17/787749

Inventors:

Steven M. BALDWIN - Akron OH, US
Walter A. SALAMANT - Akron OH, US
- Tokyo, JP

International Classification:

C08F 136/08

Abstract:

A process for preparing a polydiene, the process comprising (i) preparing an active catalyst composition by combining a rare-earth compound including a rare-earth metal, an alkylating agent, an aluminoxane, and optionally a halogen-containing compound, where the catalyst composition includes halogen at molar ratio to the rare-earth metal of from about 0.5:1 to about 2.0:1; and (ii) introducing the active catalyst composition to conjugated diene monomer.

US Patent:

20190185598, Jun 20, 2019

Filed:

May 19, 2017

Appl. No.:

16/302930

Inventors:

- Tokyo, JP
Kevin M. McCAULEY - Akron OH, US
Zachary A. BUSH - Akron OH, US
Steven M. BALDWIN - Akron OH, US

Assignee:

Bridgestone Corporation - Tokyo

International Classification:

C08F 136/06
C08K 5/524
C08K 5/13
C08K 5/18

Abstract:

A method for method for preparing a functionalized polymer, the method comprising the steps of preparing an active polymerization mixture including a reactive polymer by polymerizing conjugated diene monomer with a lanthanide-based catalyst; introducing a heterocyclic nitrile compound with the reactive polymer to form a functionalized polymer within the polymerization mixture; introducing a quenching agent to the polymerization mixture including the functionalized polymer, where the ratio of water or protic hydrogen atoms in the quenching agent to the lanthanide atoms in the lanthanide-based catalyst is less than 1500 to 1.